1. Packages in Java.

• Built packages to manage the project conviniently.
• com.EMS._abstract provides interfaces for all classes.
• com.EMS.core implements interfaces in com.EMS._abstract to manage Employees and Organizations.
• com.EMS.iomanager implements interfaces in con.EMS.core to manage data files of Employee and Organization classes.

2. Interfaces (Abstraction in Java).

• Built interfaces in package com.EMS._abstract to create an abstraction.
• BaseOrganization - A base class for class Organization in com.EMS.core.
• BaseEmployee - A base class for class Employee in com.EMS.core.
• IOManager - A base class for all classes in com.EMS.iomanager.

3. Getters and Setters.

• Built getters and setters for all the attributes in all the classes in all packages.
• Built getters and setters in class Employee present in package com.EMS.core.
• Built getters and setters in class Organization present in package com.EMS.core.
• Built getters and setters in class IOManagerEmployee present in package com.EMS.iomanager.
• Built getters and setters in class IOManagerOrganization present in package com.EMS.iomanager.

4. File Management.

• Use several classes present in package java.io for proper file management.
• Built package com.EMS.iomanager to store Employee and Organization data in files.
• class IOManagerEmployee manages Employee data.
• class IOManagerOrganization manages Organization data.

5. Serialization and Deserialization.

• Built serializable classes to save raw java objects as .ser files and retrive them later to work with.
• Method serialize present in class Employee (present in package com.EMS.core) serailizes Employee objects.
• Method serialize present in class Organization (present in package com.EMS.core) serailizes Organization objects.
• Static Method deserialize present in class Employee (present in package com.EMS.core) deserailizes Employee objects.
• Static Method deserialize present in class Organization (present in package com.EMS.core) deserailizes Organization objects.

6. Multiple Inheitance.

• Perform multiple inheritance in several classes to demonstrate and test the behaviour of different classes and their objects.

7. Polymorphism or Method Overriding.

• Use the concepts of method overriding to perform Polymorphism.

8. Constructor and Parameterized Constructor.

• Create constructor and parameterized constructor for all classes to initialize the attributes appropriately.

9. String and StringBuffer Methods

• Use multiple String and StringBuffer methods for managing the output on console and in files.

10. Exceptions.

• Used try, throw and catch blocks to print proper exception message and handle exceptions. Use throw and throws keywords to throw proper exceptions.

11. Methods and Static Methods.

• Mostly Everything is done using methods and at times static methods is used to deserialize objects.

12. Custom Exceptions and Exception Handling.

• Built com.EMS.exceptions package with custom exceptions and add exception handling in all the classes in all packages.

13. A list of keywords used:

• this for accessing class variables.
• final to declare constant variables.
• static to create a static block of code.
• try, catch, throw and throws for exception management.
• interface to create a interface.
• transient to declare non-serializable objects.
• public and private access modifiers to declare methods, classes and variables.
• Many other common and trivial keywords.

1. JavaDoc tool for documentation.

• Used JavaDoc tool to write and generate documentation for the project.

2. Continuous Integration

• Used CI tools like TravisCI and LGTM to automatically build the project.